f= open("teste.txt", "w")
s = "treta"
for k in range (10): f.write(s); f.write ("\n")
f.close ()
f = open ("teste.txt" , "r")
#f.seek (5)
#print f.tell ()
x= f.read (6)
print x
c= 0
for line in f:
    print "{0}: ".format(c), line
    c+=1
f.close ()
#with open ("teste.txt", "r") as f:
 #          x=f.readline ()
  #         if x== 'treta\n': print "voila"
